IN HUMAN PHYSIOLOGY. 179 



23. Why do we relish butter on bread ? 



Butter supplies the carbonaceous element in which 

 bread is lacking. 



24. Is chewing tobacco more injurious than smoking? 



(See Cutler's Physiology, pages 242-4.) 



It is not only more filthy, but also more detrimental to 

 the health, as thereby a greater proportion of the poison- 

 ous alkaloids of the tobacco is carried into the system. 

 Among the too frequent evil effects of this powerful 

 narcotic are an impaired nutrition, a poisoned circulation, 

 a stupefied mind and conscience evils which end not with 

 the parent but are transmitted many-fold to the child. 



25. Why should ham and sausage be thoroughly cooked ? 



The trichina, which frequents pork, is only destroyed 

 at a high temperature. 



26. Why do we wish butter on fish, eggs with tapioca, oil 

 on salad, and milk with rice ? 



To supply the elements of food lacking in the compo- 

 sition of fish, tapioca, etc. 



27. Explain the relation of food to exercise. 



Their relation is exceedingly intimate. If we eat much 

 we should take more exercise, and if, on the contrary, we 

 labor more, we desire additional food. Violent exercise, 

 directly after a hearty meal, is injurious ; but a gentle, 

 quiet half-hour's saunter will greatly benefit the digestion. 



28. How do you explain the difference in the manner of 

 eating between carnivorous and herbivorous animals ? 



Meat requires less saliva to aid in its digestion, and 



